Pneumatic tire.



A. BONNET.

PNEUMATIC TIRE.

APPLICATION nun MAY 20. 1900.

Patented May 3, 1910. 7

INVEIN UK ATTU N .vehicle wheels.

band is secured in place by means such as UNITED ADRIEN BONNET, OFPARIS, FRANCE.

PNEUMATIC TIRE.

Specification of Letters Patent.

Patented May 3, 1910.

. Application filed May 20, 1908. Serial No. 433,804.

To all whom it may concern:

Be it known that I, ADRmN BONNET, a citizen of the Republic of France,and resident of Paris, France, have invented a new and useful PneumaticTire, which improvement is fully set forth in the followingspecification.

This invention relates to pneumatic tires and more particularly to theconstruction of outer covers for the pneumatic tires of The coveraccording to this invention is chiefly characterized by the provision ofa groove formed in a tread-band of. eresent shaped section with whichthe tire is provided, in which grooveis placed the U- shaped heel of aprotecting band, the sideportions of which overlap the tread-band at thesides of the groove. The protecting ametal ring compressing the U-shapedheel in the groove, said ring, however, being located in the groove insuch a manner that it does not contact with the ground. By thearrangement of the protecting band and ring. in the manner stated thetire is fully protected against puncturing, heating, and bursting.

In the accompanying drawings, Figure 1 is a transverse section through apneumatic tire showing the improved cover, and Fig. 2 is a top plan viewof the same.

In the said drawing a is the inner tube of the tire, I) the outer coverproper and c thetread band of the cover. In the treadband 0 is formed inthe oentral'plane of the tire, a groove rounded off at the bottom, inwhich groove is arran ed a protecting and tread band d made of eather orother suit-- able material, plain, in one or more pieces. The band d orthe portions of the band, comprise a heel e which fits into the grooveand enga es with the raised portions provided for t e purpose ofavoiding sliding in the longitudinal direction. The bandd 18 moreover,provided .with two parallel tread surfaces 7 which extend laterally, onthe right and on the left hand side on the tread band. The said surfaceshave the shape of the portions of the tread band which they cover. Ifthe tread band forms, as in the construction illustrated, projectingportions at each side of the grooves, the surfaces 7 are rounded off.

A metal cirelet or ring 9 which is placed into the heel of the band cl,keeps the latter in place on the tire. The circlet g is preferably acontinuous ring. The circlet is put in place before inflating the innertube,' the tightening being brought about by the inflation. Thethickness of the circlet g is such that it never touches the ground. In

this way, the transmission to the cover of heat which would be producedby the metal sliding on the ground, is avoided. On the contrary, thearrangement of the ring in the recessed groove produces a circulation onthe whole circumference of the tire, o a current of air which cools thecover just at the portion in contact with the road.

The construction of the cover described has the following advantages: 1.Punctures and bursting are practically impossible as the cover isprotected in the center by the metal ring, and at the right and lefthand side by the protectin band, the thickness andthe strength of w ichcan vary to suit the weight of the vehicles, the speed desired etc.; 2.Doing away with the heating of the cover and consequently of the innertube,

the tread band being independent of the said cover on which it does notact by friction, but simply by compression; 3. Great durability of thecover which is not in contact with the roadand can be only slightlyinfluenced by the effects of compression exercised by the band; 4.Facility and quickness of replacing the band which make it possiblealways to travel under the best conditions and with the maximum ofsafety;

5. Doing away with spare covers which are so cumbersome to carry andreplacing them -by a few bands of a small volume; 6. Side slipping isless to be feared, even with a lain band, since the two paralleltreadsuraces are separated by a hollow;"7. More complete absorption of shocksdue to inequalities on the roads and to obstacles, the arrangement of agroove necessarily requiring greater thickness than in usual covers.

Having thus described my invention I claim:

In a pneumatic tire, the combination of an inner tube, an outer coverfor the inner tube, an inner tread-band of ge seentshaped cross-sectionand having a central annular groove in the outer face thereof, the faceof said band being transversely curved adjacent to said groove, an outering to the faces of said groove and, the specification in the presenceof two subcurved fiice adjacent thereto, and a circlet scribingWitnesses. or rin iavin flattened inner, outer and side. fa zes and%ittin; snugly in said groove, ADRIEN BONNET the depth of said groovebeing much greater Witnesses: than the depth of said circlet. I EMILELEDRET,

In testimony whereof I have signed this H. C. CoxE.

